of cleveland



H. N. CAIN.

INSERT FOR CONCRETE. APPLICATION F'ILED MAR.29. ma.

Patented Sept. 2, 1919.

fizz/5222271: f/arry JV. Cain,

UNITED STATES PATENT OFFICE.

HARRY N. CAIN, F CLEVELAND, OHIO, ASSIGNOR TO THE DONLEY BROTHERS COMPANY, OF CLEVELAND, OHIO, A CORPORATION.

INSERT FOR CONCRETE.

Specification of Letters Patent.

Patented Sept. 2, 1919.

Application filed March 29, 1918. Serial No. 225,542.

To all whom it may concern: Be it known that I, HARRY N. CAIN, of

, Cleveland, in the county of Cuyahoga and State of Ohio,have invented new and useful Improvements in Inserts for Concrete, of

which the following is a specification.

This invention relates to metallic means for firmly anchoring a" removable bolt to structures of self-hardening plastic material,

offer an insert ofthis character capable of holding fast without damage to itself, or to the concrete structure, maximum load its bolt can sustain. Either the insert displaces so much concrete as to materially weaken the structure, or, as 1s usually the case, its anchoring means, or its shell, bend or give way, or crumble or break out portions of the concrete, under hghter loads than the anchor-bolt is capable of bearing.

Therefore, the prime object of the present invention is to produce an insert capable of holding fast the greatest load its anchor-bolt can sustain, with a minimum weakening displacement of concrete. To this end, the anchorage of the insert is formed to meet directly the strains to which it is subjected, whereby less metal is required than to sustain indirect strains; and the anchoring roots are spread apart to receive a large and strong mass of concrete between them. A further object is to provide practically for receiving andholding in an insert bolts of different sizes.

Minor objects will become apparent from the following description of a preferred embodiment of the invention, reference being had to the accompanying drawing, in which Figure 1 is a side elevation of the insert.

Fig. 2 is a longitudinal section of the insert shell taken on the center line.

Fig. 3 is a view of the bottom, or face, of the device.

Fig. 4 is an elevation sectioned on line 44 of Fig. 1.

Fig. 5 is a section like Fig. 4 showing the insert embedded in concrete, and a small sized bolt therein.

The reference letter a indicates the hollow body portion, or shell of the insert, and b when subjected to the.

and b are its prong-like anchoring roots; 1ts form being suitable for a casting of iron, steel or other metal. In service the insert is embedded in the concrete, or other plastic hardening. material, of a wall, ceiling or floor structure, as shown at c, Fig. 5, the plane face all of the device being flush with the outer surface of the concrete.

The usual, or any suitable laterally projecting 'flanges e are provided, each being recessed to receive a nail f to secure the insert in place on the false wood work, or mold boards, before the concrete is poured in and tampcd about it. After the concrete has hardened and the form boards removed therefrom, the nails f may be cut off flush with the surface, as shown in Fig. 5.

Extendin lengthwise along the greater portion of a 0th sides of the face at of the shell a are strong inwardly projecting flanges g, forming a bolt-slot h therebetween, which slot leads into a wider rectangular opening 71 at one end, and is terminated by the shell wall at its other end; thus forming a keyhole-shaped aperture in the face of the insert for the reception of a bolt and its adjustment longitudinally of the device.

The inner surfaces of the side and end walls of the shell a extend at right angles to the face 01 'to about the height of the head of a bolt which they and the slot 72. are fitted to receive, such a bolt being indicated by dotted lines at j, Figs. 2 and 4. The side walls should be tapered on their outer sides, as shown in section in Figs. 4 and 5, so as to be heavier adjacent to the flanges g. The innerwall or cover of the shell a is curved, as shown, opposite the opening 2', so that the head, or nut, of a 'bolt 9' may be inserted through the said opening by tilting it; but the main portion of the cover is inclined inwardly from the end walls as at 70, and from the side walls as at Z, the sides Z meeting at a sharp median angle, like an inverted V as shown in section in Figs. 4: and 5.

The anchoring means comprise v two straight root-arms b and b branching from the cover of the shell at, their center lines lying in the central longitudinal plane of the lnsert, but making equal angles with a transverse plane perpendicular to the face d. The horns b and b are strongly filleted to the inclined walls 70 and Z, and, as seen in Fig. 1 taper smaller toward their terminations; ut, as seen in Fig. 4, they are much broader, and taper larger toward their outer ends to provide anchorage. The said members I). and b terminate respectively in knobs m and m, being flange-like protuberances V position-of the centerline ofthe :bolt,-{and: the force lines of b and 6. .meetithe nor:

Thus, the resultant-ofthe reactions bib;

and b1 coincides with the middle or ,normal 7 mal central point of application ofthe pull.

. cories o thi f ent m y mohfiimdibr StI'ZLlIl. Av smaller sized in'th'e insert, 'as-sho -n atj, Fig. 5, by'proe viding it with a square asher a. The bolt-.

of the bolt against the insert .v--Therefore, it should be a readily .iunderstood that-the straight anchor-arms b and b anc l-th e -in-- clined sidesla and .Z serve to-transriaitthej pull of thejbolt j to the anchorage yer-y di rectly; .and'the massof concrete between,

- the said anchor-arms, Which must crumble.

before'the l-nsert' can loosen, is large'iand strong, and properly shaped to resist the bolt: than. may be used head and washer can be I inserted through the opening 2', and, when resting. against the flanges g, the bolt-head is "raised high;

major part enough to be kept from turning by the in;

clined Walls Z.- 1 I further-point out and distinctly claim as myinvention 1. Inan insert for concrete, a hollow body adapted to receive and seat a removable bolt projecting therefrom, a pair of anchoring arms branching straight throughout their lengths from the inner side of said body so as to receive between them a V-shaped longi-- tudlnfal section of concrete, sa1d arms belng flattened transversely an .tapered and",

angeflike pmtuberances on the ext e i i f a r 2. In .an insert rob concrete a hollow body 7 ardaptedito recelvegand seat aremovable bolt; prmectingtherefmm, cgverformed'by nl d m er p r ons of the'endiand Side walls of saidfbody, the sidewalls, or sa Cover forming a sharp salient angle at the center line of the device adapted to receive and e gage bolt-heads o v rious. Widths, and arms branching from the cover and pr i d ith nch ring means] l A In testimony ,vvhereof I aflix ,my signature t e pr sence of ,twov u scfibing witn se a vel nd, O o, t is iofi day, iJMa clhs;

1918,. .1 V r 4 HAR Y -oAIN. -'.Wi tnesses;: 7 V,

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